紫黑吸水链霉菌( Streptomyces violaceoniger-hygroscopicus)发酵代谢产物对几种常见果蔬病原菌的拮抗活性

从南昌地区不同土质中采得约300份土样，用平板分离法筛选得到8株放线菌，经分类鉴定，其形态、培养特性、生理生化特性与紫黑吸水链霉菌形似．命名为紫黑吸水链霉菌Streptomyces violaceoniger-hygrowopicus S-1、S-2、S-3、S-4、S-5、S-6、S-7和S-8,用其代谢产物对果蔬病原真菌——青椒疫霉病菌Phytophthora capsici、番茄灰病菌Botrytis cinerea、黄瓜枯萎病菌Fusarium axysporum f.sp.cucumerinum、黄瓜灰霉病菌Botrytis cinerea Pets、苹果黑腥病菌Venturia inaeualis、白菜黑斑病菌Alternaria brassicae等进行拮抗实验研究，结果表明有2株菌株的代谢产物对青椒疫霉病菌有明显的抑制作用，1株对黄瓜枯萎病菌有较好的抑制作用，1株对番茄灰霉病菌有一定的抑制效果。

Antagonistic Activity of Metabolites on Several Important Pathogens of Vegetable- Fruit Produced by Streptomyces Violaceoniger - Hygroscopicus

Eight strains of Actinomycetes were isolated from 300 soil samples from different places of (Nanchang,)Jiangxi province by dilution plate method.Through identification, these strains isolated are very (similar) to streptomyces violaceoniger-hygroscopicus in shape,culture feature,physiological and biochemical characteristics. So these strains are named as Streptomyces violaceoniger-hygroscopicus S-1, S-2, S-3, S-4, S-5, S-6, S-7 and S-8. Antagonistic activity of their fermentation metabolite was tested against (several) important pathogens of vegetable-fruit including Phytophthora capsici, Botrytis cinerea, Fusarium oxysporum f.sp.cucumerinum, Botrytis cinerea pers, Verturia inaeualis, Alternaria brassicae. The results of experimentation show that of the 8 strains, two were found to have strong antagonistic activity against (paytophthora) capsici,and one against Fusarium oxysporum f.sp.cucumerinum, one against botrytis cinerea effectively.